Ring holding arbor



May 16, 1-933. c. H. WARREN 1,909,323

RING HQLDING ARBOR Filed Sept. 17, 1930 lngenjjor B Chm-3&5 H. avrzn Arkomggs Patented May 16, 1933 UNITED STATES cnAnLns n. WARREN, or SPARTAQMICHIGAN RING HOLDING ARBOR Application filed September 17, 1930. Serial No. 482,479.

' inner surface.

This device is particularly intended for holding a plurality of piston rings arranged side by side for the purpose of splitting them although other analogous articles may be gripped by a device of the same nature and other operations performed upon the articles so held upon the arbor. The piston rings intended to be gripped by the arbor are of substantially the same inner dimension but are customarily slightly in variance in the inner dimension and it is necessary, when a plurality of such rings are placed upon the arbor, that each of them must be individually gripped in a manner to compensate for the slight variance in dimension. The fact that this device is intended to hold the ring so that it may be split precludes gripping the ring longitudinally of its axis because such gripping would result in pinching the splitting tool while an internal expanding clamp readily permits splitting the ring without such pinching action.

The invention provides various new and useful features of construction and arrangement as hereinafter more fully described and particularly pointed out in the claims, reference being had to the accompanying drawing, in which,

Fig. 1 is an axial section of a portion of an arbor embodying the inventionand showing a part of a conventional ring splitting tool in association therewith.

Fig. 2 shows the forward portion of the device illustrated in Fig. 1 with the clamping members in retracted position and with the rings in partly assembled position, and

Fig. 3 is a transverse section on the line 3-3 of Fig. 2 with the piston rings omitted.

Like numbers refer to like parts in all the figures.

1 represents the arbor which is preferably attached to a rotatably mounted spindle 2 by means of screw threads 3 and the arbor and spindle have an axial opening 4. The

forward end of the arbor 1 is reduced in external diameter and is slotted longitudinally I at a plurality of locations 5 forming a plurality of forwardly extending spaced'apart arc-shaped extensions 6. A shoe 7 is located in each of the slots 5 and has its inner end v inclined in relation to the axis of the arbor and a tapered expander 8 is slidably mounted in the axial opening 4 and has inclined surfaces 9 corresponding with and in engagement with the inclined surfaces of the re- 69 spective shoes 7. The expander 8 is provided with a key slot 10 within the arbor and a pin 11 mounted in the arbor extends into the key slot to prevent rotation of the expanding member relative to the arbor. A stop pin 12 in the key slotprevents accidental withdrawal of the expander by engagement with the pin ll. An actuatingrod 13 is attached to the rear endof the spindle member 8 and extendsthrough the axial openin 4 of both 7 the arbor and the spindle 2 and in ay be operated by any suitable'power, it being intended that a compressed air device be attached to the rod 13 to operate it.

Each of the shoes 7 has a saddle 14 pivotally mounted in it, preferably by means of a hollow pivot pin 15 and each saddle has two spaced apart rockers 16 pivotally mounted thereon on pivot pins 17. Each rocker 16 v has two outwardly disposed engagement surfaces 18, one at each side of its pivot whereby each shoe is provided with four engagement surfaces which is equal to the number of rings to be clamped on the arbor and the engagement surfaces 18 are spaced longitudinally of the arbor substantially equal to the width of the rings to be clamped.

Four clamping rings 19 surround the shoes and forward projections 6 of the arbor and each is engaged on its inner surface by, one 99 of the engagement surfaces 18 ofthe respective rockers 16. The rings 19 are divided at 20 where a pin 21 is provided for each ring and fixed to one of the forward extensions 6 of the arbor, the pin 21 being 10- cated in the opening of the ring to prevent rotation of the ring 011 the arbor, and the clamping rings 19 are flexible and have a tendency to contract in diameter. The piston rings 22 to be operated upon are of sub- 39.9

stantially the same width as the clamping rings 19 and their inner diameters are somewhat larger than the outer diameter of the clamping rings when the clamping rings are contracted. Longitudinal movement of the expander 8 causes the inner surfaces of the shoes 7 to traverse the inclined surfaces 9 of the expander which results in radial movement of the shoes and the members carried thereby. An annularly arranged spring 23 extends through each of the hollow pivot pins and exerts a force tending to move the shoes toward the axis of the device thus holding the inner surfaces constantly in engagement with the inclined surfaces 9 of the expander 8.

In using the device the expander 8 is moved forwardly permitting the shoes and the members carried thereby to retract inwardly and the erqgander rings 19 to contract in diameter so that their outer diameters are smaller than the inner diameters of the rings 22 to be operated upon. Four piston rings 22 are then inserted in place over the expander rings 19 and the expander 8 is moved rearward-1y by means of the rod 18 which thrusts the shoes 7 outwardly until the expander rings 19 tightly engage and grip the inner surfaces of the piston rings 22.

A threaded opening 8a is provided in the end of the expander 8 whereby a device for pushing the rings 22 longitudinally into place may be attached. This device is illustrated in my copending application Ser. No. 499.,-

i 892, filed November 3, 1930.

In this expanding and gripping movement an equalization of pressures is effected by means of the compensating movements of the pivoted saddle 14 and the pivoted rockers 16. As previously stated, the piston rings 22 have inner diameters of slightly varying dimensions and the variance between the two adjacent rearward rings 22 will be accommodated by rocking of the rear rockers 15 and the variance between the two adjacent forward rings 22 will likewise be compensated for by rocking of the forward rockers 16 on their pivotal connections with the saddles 14 while any variance between the average diameters of the two rearward piston rings and the two forward piston rings will be compensated for by rocking of the saddle 14 on its pivot 15. In this manner an equal pressure is exerted upon each of the piston rings 22 when clamped so that each inclividual ring is firmly gripped without 'rela tion or dependence upon any of the other rings and regardless of the variations in internal diameters of the respective rings.

After being so clamped and gripped by the arbor the arbor is rotated by means of the spindle 2 upon which it is mounted and the rings are split by engagement of a splitting tool 24 as it is moved against them. It is obvious tha't other operations may be performed upon the rings so clamped upon the arbor such as turning their outer surfaces, etc., and after the rings have been operated upon they are released by moving the expander 8 forwardly thus permitting the shoes 7 and members carried thereby to retract under action of the spring 23 releasing the rings so that they may be readily removed.

I claim:

1. A ring holding arbor comprising a body, a plurality of expanding rings associated with said body equal in number to the num- 'ber of rings to be mounted on the arbor, said expansion rings being adapted to expand and contract and to engage the inner surfaces of the respective rings to be mount-ed on the arbor, means for expanding said expansion rings and means associated with said expanding means for compensating for differences in the innner dimensions of the rings mounted on the arbor whereby each of the rings mounted on the arbor will be clamped 011 its inner surface with substantially equal pressure.

2. A. ring holding arbor comprising a body, a plurality of shoes associated with said body and radially movable relative thereto, a plurality of expansion rings surrounding said shoes equal in number to the number of rings to be mounted on the arbor, means for moving said shoes radially and means carried by said shoes for engaging the inner surfaces of said expansion rings and for compensating for differences in inner dimension rings and for compensating for difierences in inner dimensions between the rings to be clamped upon the arbor.

3. A ring holding arbor comprisingxa'body, a plurality of shoes mounted for radial movement on said body, means for moving said shoes radially, a plurality of expansion rings surrounding said shoes and adapted to engage the inner surfaces of a plurality of rings to be mounted upon said arbor, anda pivoted member on each of said shoes adapted to engage different ringso'f saidplurality of expansion rings on opposite sides of its pivot.

4. A ring holding arbor comprising a body, a plurality of shoes mounted for radial movement on said body, a plurality of expansion rings surrounding said shoes and adapted to engage respectively the inner surfaces of a plurality of rings to be mounted on said ar'bor, a saddle member pivotally mounted in each shoe, rocker members pivotally mounted at opposite sides of the pivot of said saddle member, each of said rocker members being adapted to engage a different ring of said plurality of expansion rings at opposite'sides of its pivot and means for moving said-shoes radlally.

5. A ring holdlngarbor comprisingabody,

having an-axialopening, a plurality of shoes mounted for radial movement on said body,

the body for moving said shoes radially, a

' plurality of expansion rings surrounding said shoes and adapted to respectively engage the inner surfaces of a plurality of rings to be mounted on the arbor, a saddle pivotally mounted on each of said shoes, a rocker member pivotally mounted on said saddle member at each side of the pivot thereof, and each rocker member engageable with a different ring of said plurality of expansion rings at opposite sides of its pivot.

6. A ring holding arbor comprising a body, a plurality'of shoes mounted for radial movement on said body, means for moving said shoes radially, a plurality of expansion rings surrounding said shoes and adapted to engage the inner surfaces of a plurality of rings to be mounted upon said arbor, and means on each of said shoes adapted to engage difi'erent rings of said plurality of expansion rings.

7. A ring holding arbor comprising a body, a plurality of shoes mounted for radial movement on said body, means for moving said shoes radially, a plurality of expansion means surrounding said shoes and adapted to engage the inner surfaces of a plurality of rings to be mounted upon said arbor, and a pivoted member on each of said shoes adapted to engage said expansion means internally.

8. A ring holding arbor of the character described comprising a hollow body, a plurality of shoes associated with said body and movable relative thereto in an exact radial direction, a member having two flat seats thereon, pivotally mounted on each of said shoes and adapted to seat and exert pressure at opposite sides of its pivot on different rings of a plurality of rings adapted to be mounted on said arbor and means for moving said shoes radially, said means being located in part within the hollow portion of the said body.

In testimony whereof I aflix my signature.

CHARLES H. WARREN. 

